K.C.S.E Physics Q & A - MODEL 2002PP2QN04

K.C.S.E Physics Q & A - MODEL 2002PP2QN04

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 a) Fig 5. Shows the variation of temperature, T (0C), with time, t (seconds). When frozen water is heated for sometime

(i) Explain the shape of the curve at the parts labeled AB and C.
(ii) It is observed that when the temperature starts to rise, the volume initially decreases and then increases. State the reason for this observation.
(iii) In the fig. 5 sketch and explain the curve that would be obtained if frozen water was used. (Hint: specific heat capacity for seawater is lower what of fresh water.
(b) Determine the quantity of heat energy required to change 3.0 kg of ice at 0 C to water at 5 °C Specific latent heat of fusion of ice is 3.36 x 10⁵J/kg. Specific heat capacity of water is 4200J/kgK)

answers